Zimmermann (biceps) could return in early-to-mid-August, Roch Kubatko of MASNSports.com reports.

This is the third time since he was placed on the IL on June 18 that the O's have estimated he was two or three weeks away, so we'll take this timetable with a grain of salt. Once healthy, Zimmermann will likely be sent to the minors to build back up.

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